Asymmetrical siloxy disulfide compounds
AssigneeThe Goodyear Tire & Rubber Company
InventorsPaul Harry Sandstrom, Lawson Gibson Wideman, Theodore Lamson Folk
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Abstract
The present invention relates to asymmetrical siloxy compounds of the formula 1 wherein R1, R2 and R3 are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms; and R4 is selected from the group consisting of substituted or unsubstituted alkylene groups having from 1 to 18 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 12 carbon atoms. The asymmetrical siloxy disulfide compounds are prepared from N-cyclohexylthiophthalimide and a mercaptoalkoxysilane.
Claims20
A compound of the formula
- 10
- wherein R1, R2 and R3 are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms;
- and R4 is selected from the group consisting of alkylene groups having from 1 to 18 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 10 carbon atoms.
A method of processing a silica-filled rubber composition which comprises mixing
- (i) 100 parts by weight of at least one elastomer containing olefinic unsaturation selected from conjugated diene homopolymers and copolymers and from copolymers of at least one conjugated diene and aromatic vinyl compound;
- (ii) 10 to 250 phr of particulate precipitated silica;
- (iii) 0.05 to 15 phr of an asymmetrical siloxy compound of the formula
- 11
- wherein R1, R2 and R3 are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms;
- and R4 is selected from the group consisting of alkylene groups having from 1 to 15 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 10 carbon atoms.
A sulfur vulcanizable rubber composition comprising an elastomer containing olefinic unsaturation, silica and a compound of the formula
- 13
- wherein R1, R2 and R3 are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms;
- and R4 is selected from the group consisting of alkylene groups having from 1 to 18 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 10 carbon atoms.
A process for the preparation of asymmetrical siloxy disulfide compounds comprising reacting
- (a) N-cyclohexylthiophthalimide;
- (b) a mercaptoalkoxysilane compound of the formula
- 15
- wherein R1, R2 and R3 are independently selected from the group consisting of alkoxy groups having 1 to 8 carbon atoms;
- and R4 is selected from the group consisting of a substituted or unsubstituted alkylene group having a total of 1 to 18 carbon atoms and a arylene and alkoyl substituted oxylene group having a total of 6 to 12 carbon atoms.
Dependencies are inferred from the claim text.